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Patent

Optical fiber characteristic evaluating device

Tsuneo Horiguchi, +1 more
TLDR
In this paper, the back Brillouin scattered light generated by a probing light source is taken out by a selecting and taking out device to be detected by a photodetector.
Abstract: 
PURPOSE:To effectively evaluate an optical fiber characteristic by allowing a probing light from a probing light source to be made incident on an optical fiber to be measured, taking out selectively a generated back Brillouin scattered light and detecting it by a photodetector. CONSTITUTION:A probing light emitted from a probing light source 1 is sent to an optical fiber to be measured and generates a Brillouin scattered light. Subsequently, a back Brillouin scattered light which is scattered in the rear in the optical fiber to be measured 4 is taken out selectively by a selecting and taking out device 6. In this state, an optical demultiplexer 2 couples the probing light from the probing light source 1 to the optical fiber to be measured 4, and also, couples the back Brillouin scattered light generated in the optical fiber to be measured 4 by its probing light to the selecting and taking out device 6. The back Brillouin scattered light which has been fetched by this selecting and taking out device 6 is detected by a photodetector 7, and an electric signal which has been brought to photoelectric conversion is brought to signal processing 8. In such a way, an optical fiber network containing not only a cascaded optical fiber line but also a branch fiber line can be measured and evaluated by separating each optical fiber loss or fault position.

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Patent

Distributed optical fiber sensor

Kinzo Kishida, +2 more
TL;DR: In this paper, a distributed optical fiber sensor utilizing the Brillouin scattering phenomenon was proposed, which is capable of measuring strain and temperature with high accuracy and high spatial resolution without requiring any manual adjustment.
Patent

Backward brillouin scattering optical time domain reflectometry

Haruo Yoshida
TL;DR: In this article, an improved backward Brillouin scattering optical time domain reflectometry (OTDR) device is provided which is capable of detecting the deterioration of or anticipating the fracture in an optical cable or optical fiber.
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Apparatus for measuring the characteristics of an optical fiber

Yahei Koyamada
TL;DR: In this paper, an optical pulse generator generates, from a coherent light, first and second optical pulses having a time interval which is equal to or shorter tan a life time of an acoustic wave in the optical fiber.
Patent

Optical telecommunications network terminal, an installation including the terminal, and a method of detecting a break in optical transmission means

Naveena Genay, +2 more
TL;DR: In this paper, the authors proposed an optical telecommunications network terminal that includes a generator for generating downlink optical signals and a receiver for receiving uplink optical signals, the optical signals being conveyed in optical transmission means connected to the terminal.
Patent

Optical communication system and optical test device

Nagetsu Honda, +2 more
TL;DR: In this article, optical identification markers 10-1 to 10-4 having respectively different Brillouin shift frequency bands are formed in terminal side optical fibers 4-1-4-4.